Organocatalytic Michael Addition of Nitro Esters to α,β-Unsaturated Aldehydes: Towards the Enantioselective Synthesis of<i>trans</i>-3-Substituted Proline Derivatives
作者:Man-Yi Han、Yong Zhang、Huai-Zhen Wang、Wan-Kai An、Bao-Chun Ma、Yuan Zhang、Wei Wang
DOI:10.1002/adsc.201200538
日期:2012.10.8
five-step strategy has been developed for the enantioselective synthesis of trans-3-substituted proline derivatives with high diasteroselectivity (dr>20:1) and enantioselectivity (up to 97% ee). The key step is the asymmetric organocatalyticMichaeladdition of nitro esters to α,β-unsaturatedaldehydes, which affords the chiral Michael adducts in high yields (up to 96%) and excellent enantioselectivity
Pd-Catalyzed directed<i>CH</i>-(hetero)arylation of cyclic α-amino acids: effects of substituents and the ring size
作者:Valeriia Hutskalova、Pavel K. Mykhailiuk
DOI:10.1039/c9ob00393b
日期:——
A systematic study on the directed Pd-catalyzed (hetero)arylation of 26 substituted cyclic α-amino acids at the C(3)-atom was performed. For the first time, the 7- and 8-membered cyclic amino acids were introduced to C–H activation. 8-Aminoquinoline was used as a directing group. Effects of the ringsize and the substituents on the reaction efficacy and stereoselectivity were studied.
Discovery of inhibitors of the channel-activating protease prostasin (CAP1/PRSS8) utilizing structure-based design
作者:David C. Tully、Agnès Vidal、Arnab K. Chatterjee、Jennifer A. Williams、Michael J. Roberts、H. Michael Petrassi、Glen Spraggon、Badry Bursulaya、Reynand Pacoma、Aaron Shipway、Andrew M. Schumacher、Henry Danahay、Jennifer L. Harris
DOI:10.1016/j.bmcl.2008.08.029
日期:2008.11
Structure-based design was utilized to guide the early stage optimization of a substrate-like inhibitor to afford potent peptidomimetic inhibitors of the channel-activating protease prostasin. The first X-ray crystal structures of prostasin with small molecule inhibitors bound to the active site are also reported.
Augustyns, K. J. L.; Lambeir, A. M.; Borloo, M., European Journal of Medicinal Chemistry, 1997, vol. 32, # 4, p. 300 - 310
作者:Augustyns, K. J. L.、Lambeir, A. M.、Borloo, M.、Nmeester, I. De、Vedernikova, I.、et al.
DOI:——
日期:——
A Practical Synthesis of <i>Trans</i>-3-Substituted Proline Derivatives through 1,4-Addition
are important building blocks for conformationally restrained peptide analogs, was developed. The method relies on a Cu-catalyzed 1,4-addition of Grignardreagents to N-protected 2,3-dehydroproline esters, efficiently prepared in a new one-pot protocol. The 1,4-addition products are obtained with good trans-selectivity (dr 5:1 to 25:1). A nonracemic sample of N-Cbz-3-vinylproline (74% ee) was obtained